NEET Sample Paper NEET Sample Test Paper-19

  • question_answer 77) The number of moles of oxygen obtained by the electrolytic decomposition of 90 g water is

    A)  2.5                

    B)  5

    C)  6.5                

    D)  1.25

    Correct Answer: A

    Solution :

    Water is electrolysed as follows: \[2{{H}_{2}}O2{{H}_{2}}+{{O}_{2}}\] 36 g of\[{{H}_{2}}O\] yield = 1 mol of oxygen 1 g of \[{{H}_{2}}O\]will yield \[=\frac{1}{36}\] mol of \[{{O}_{2}}.\] 90 g of water will yield \[\frac{1}{36}\times 90\] mol of \[{{O}^{2}}\] \[=2.5\]mole of \[{{O}_{2}}\] Hence, the correct option is [a].

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